Furnace stoker



Dec. 28, 1948. O; wHlTE V 2,457,423

FURNACE STOKER Filed July 11, 1945 2 Sheets-Sheet l IN VEN TOR.

f g ah/mze Maw E. 0. WHITE FURNACE STOKER Dec. 28, 1948.

Filed July 11, 1945 2 Sheets-Sheet 2 Patented Dec. 28, 1948 UNITEDSTATES PATENT OFFICE) 2 Claims.

This present invention relates to improvements in stoker fired furnacesand involves a construction fitting the stoker to the furnace and viceversa.

Automatic coal burning stokers were originally Earlier installationsnecessarily made from the front left the stoker very much in the way andmade the removal of the clinkers inconvenient. To overcome thesedisadvantages many of the present furnaces equipped for stoker firinghave a side entrance for the stoker. Aside from this the conventionalash pit construction has been followed and a practical arrangement formaking the installation from either side is lacking. The importance ofsuch an arrangement appears from the fact that the condition of thebasement often makes it necessary to make the installation from oneparticular side.

Furthermore the usual method of installation is inconvenient and costlyand tends to shorten the life of the retort. Many installations are madeby filling in sand around the retort and laying a refractory hearth ontop of the sand. The sand collects moisture during the summer seasonwhich results in the rusting out of the retort and wind box. A furthershortcoming is found in the inefficient construction of the hearth andits support. Both often give way and expose the lower part of the retortand wind box to excessive heat causing them to burn out. In an effort toovercome this a ventilated installation has been developed which,however, still clings to the antiquated ash pit construction. The onlychange in this last installation is the substitution of a plate for thesand as a support for the refractory hearth, the ash pit itself beingopen to the air instead of being filled with sand.

The present invention starts with the conception that the furnace andstoker represent a unit in which one must be fitted to the other. Inorder to fit the furnace to the stoker, it is necessary to support thefurnace above the ground by legs, thereby eliminating the ash pitentirely. The closed bottom of the furnace has only an opening for theretort, the opening being reinforced by a stiffening ring. The shape ofthe transverse cross section of the retort is immaterial. The stifieningring fits into a groove lined with asbestos rope or furnace cement andboth make an air tight seal for the bolted joint between retort andfurnace. The fastenings are so located that the windbox is reversibleand can be turned to right and left (Figure l.)

The outer end of the windbox is connected to the casing in a mannergiving it a finished appearance.

The construction hereinbefore outlined has several advantages one ofwhich is a quick and easy cost saving installation; another advantagearises from the device of the installer between the two sides of thefurnace through which the windbox extends. A third advantage lies in thelonger life of the windbox and retort. A fourth advantage is thefinished appearance of the casing and outer end of the windbox connectedthereto.

Other objects and advantages of my improved furnace will be obvious topersons skilled in this art after the construction and operation isunderstood from the following detailed description read in connectionwith the accompanying drawings in which:

Figure 1 is a vertical section of the preferred embodiment of myinvention;

Figure 2 is an enlarged vertical section on line 2-2 of Figure 1;

Figure 3 is a horizontal section;

Figure 4 is a front end view and section on line 44 of Figure 3;

Figure 5 is a vertical transverse section through the windbox.

In the drawings in which like characters of reference designatecorresponding parts throughout the several views, numeral 2 denotes theconventional casing within which the furnace 3 is supported on legs 4.The lower portion of the furnace forms a combustion chamber thecylindrical wall of which is lined with fire brick 5. The bottom 6 ofthe furnace is slightly dished and has a central aperture surrounded bya cylindrical flange 1 which extends above and below the bottom.

A windbox 8 has a transverse'oblong vertical section (Figures 2, 5) andan inner semicylindrical end portion concentric with the furnace (Figure3). Angle irons 9 are attached by welding or otherwise to opposite endsof the fiat vertical sides of the wind-box and have in their horizontalarms bolt openings H) for the lower portions of bolts II and nuts [2 ofwhich bear against the lower surfaces of the arms. The upper ends of thebolts are secured to and in lugs l3 attached or formed upon the lowersurface of the furnace bottom. The top of the windbox has in itssemi-cylindrical end a circular opening l4 formed within an inwardlyextending flange 15. A cylindrical flange [6 extends upwardly at rightangles to the first flange and is partly a continuation of thesemi-cylindrical wall forming the inner end of the windbox. The flangel6 encloses the downward-1y extending portion of the cylindrical bottomflange I.

The retort l'l consists of an outer cylindrical portion .18 the loweredge of.-which-'.is ;secured by welding or otherwise to the innermarginal portion of the flat inwardly extending flange l5 and defineswith the flange i6 an annular space. The bottom of this space is filledWithlfijSbfiSt'US rope or furnace cement l 9 and the annular space alsoreceives the lower portion of 'the bottom flange 1 extending below theunglerside gofyzthe bottom. This construction seals the gases from thespace between the furnace and casing.

The annular top surface of the bottom is cov- :=-erednwith fire:briclrs. 20 the inner: ends of. .which .formavith the adjacent outersurfaceofxtheiouter retort portion an annular space,Jfllle'dEJ-with:fur-

nace cement 25 or a-similar substance. .Theioiiter portion of the retortextends above the horizontal top surface of the fire bricks liningthenbottom f the furnace and is provided in its upper rn'argin with aplurality of aradial openingsflwvhich admit-air from the windboxto'thewcombu'stion chamber. The top of the :outer -retort1portinmisformed. by a: flat annular portion2231fr0m :the

inner retortportion 2d,-representing the frustrum of: an inverted coneand. provided atxthenupper end with a series of radial air openings-.25.

..The lowernarrow end of theinnerr-retort section is surrounded by anupwardly extending EflangeZfi on the horizontal mouth.ofiawfeedatube 21which curves laterally and vdownwardly;.and extends horizontally towardsand: through the sidewall of the furnace casing. i

Thewindbox has an outer verticalendwallzfl which is arranged to lieoutside of:the:out:er.tside ofthe casing wall: and has an-.aperturerwithi an inwardly extending; cylindrical" flange 29;;lfor-ilthe outwardly extending portion ofmthe feedrz tube.

The windbox is provided on all sides-with anjoutwardly extending flangej3fi--position=ed :inwa-rdly of the end wall of the windboxand secured bybolts 3| to the casing.

:The' feed tube 2'! extends*-outward1y;.of"3the windbox (Figures 1, 3)and is provided-in .the end :portion adjacent the outer "side of:the:::end

.wallof the Windbox withaapair-of-rradialithnead ed'apertures whichreceive each-'abo'ltv32. I'The bolts .iZbear with their. innerendsqazagainsttthe .outer sideofan'extension tube 33 which extends intothe feedv tube. 3 i

The end vwall of the windbox-hasion eithensid of the feed tube anaperture 34, onenforianair tube 35andthe other for a cleanout; tube 36.

. The above description and ...accompanying drawing (Figure 1) clearlyindicate rthatlitheiassembly comprising the retort;windbox;':feedtubefile of this patent;

4 can be connected to a furnace through either side wall of the casing.The combustion chamber has a double seal of heat resisting materialagainst the escape of gases.

I have specifically described the preferred embodiment of my inventionin all details in order to impart a full, clear and exact understandingof my invention. I do not desire, however, to be understood as confiningmyself to the precise construction'and relative'arrangem'entiof partsasdisclosed, my inventionbeing defined by my appended claims within thescope of which changes in structure and in arrangement may bemade-iwithout departure from my invention. 15. .What I claim and desireto secure by Letters *Pate'ntis: v 1.-A stokerlfed warm air heatingplant com prising a furnace having a bottom supported above 'the floorand provided with a flanged opening in the bottom thereof, a retort inthe opening 'ihaving :inn'er and 2.0111781 :parts 'joinedaat -;:'their'upper ends in spaced .relationshipjand each;hav .ing a:seri-esofztuyere apertures, a windbo'x having an opening concentricwith said first opening 5 .andza flange .surro'urldingzboth openings.andz'ithe iflange of .fthe 'i'lrst mention-ed opening; heat' resistingsealing-means betweena'the flangeaandithe ;-.w=ind;box, .a' connectionbetween'the windboxliand furnace bottom, fuel feeding meansCOIlnBCtGdiiljO 1 the: inner part of the i retortiand. extending throughthe wind-box, an airitube extending-into the windbox, and. a cleanertube...accessible from the outer side of the furnace. I

2. A; warm "air heating" plant "comprising .eaul'eg supportedurnacer'havin-g Z a centrally 1 apertured bottom :and a brick :lined'combustion chamber disposed thereabovepa cylindrical flange. in theaperture, a: retortiin the Iflange an'dzlincluding radiallyspacedooutervcand' inner partsj'oined iat 4b their upperzend's, saidretortparts. being aper- REFERENCES .crrnn The following references' are of record in the .UNITEDPSTATES (PATENTS Cross et al Oct. 8, l94-6

